Performance Study of a Low-cost Adsorbent—Raw Date Pits—for Removal of Azo Dye in Aqueous Solution

The feasibility of using natural waste (raw date pits) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption optimized conditions were obtained at low dose 1 g/L, initial dye concentration 100 mg/L, pH 2, equilibrium contact...

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Published in:Water environment research 2017-09, Vol.89 (9), p.827-839
Main Authors: Rahima, Hachani, Sabir, Hazourli, Sana, Nouacer, Zohra, Khelaifia Fatma, Nesrine, Nait Merzoug
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Anions
Aqueous solutions
Azo dyes
Calcium chloride
Capacity
Color removal
Competitive materials
Dyes
Endothermic reactions
Feasibility studies
Ionic strength
Kinetics
Order parameters
pH effects
Pits
Reaction kinetics
Regeneration
Regeneration (biological)
Removal
Temperature
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container_issue 9
container_start_page 827
container_title Water environment research
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creator Rahima, Hachani
Sabir, Hazourli
Sana, Nouacer
Zohra, Khelaifia Fatma
Nesrine, Nait Merzoug
description The feasibility of using natural waste (raw date pits) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption optimized conditions were obtained at low dose 1 g/L, initial dye concentration 100 mg/L, pH 2, equilibrium contact time 120 min, and temperature 20 °C. The corresponding adsorption capacity was around 70 mg/g and could reach 150 mg/g by increasing the ionic strength of the dye solution (0.05 M CaCl₂). These results are well modeled by Freundlich isotherm and kinetics study followed by pseudo second-order model. Thermodynamic parameters indicate that the adsorption process is endothermic and not spontaneous. The tests of desorption-regeneration showed that the studied adsorbent has the disadvantage of the loss of efficiency at its reuse but this is offset by its abundance. Based on these results, it can be used as competitive material for the removal of dyes.
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source Wiley; JSTOR Archival Journals and Primary Sources Collection
subjects Adsorbents
Adsorption
Anions
Aqueous solutions
Azo dyes
Calcium chloride
Capacity
Color removal
Competitive materials
Dyes
Endothermic reactions
Feasibility studies
Ionic strength
Kinetics
Order parameters
pH effects
Pits
Reaction kinetics
Regeneration
Regeneration (biological)
Removal
Temperature
title Performance Study of a Low-cost Adsorbent—Raw Date Pits—for Removal of Azo Dye in Aqueous Solution
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